Perhaps you should try some spelling variations:
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
cua tre » cua te, cuu tre, cua triet
dang xa » dang xay, lang xa, dang ha
ky dang » ky nang, ky danh
va cam » va cham, va cac, va cai
luc va » duc va, tuc va
loc va » hoc va
vi cua » vai cua, di cua
va cao » va cac, va co, va dao

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ky dang xa hoi. hieu ((va cam) OR (va cao)) ((luc va) or (loc va)) hanh vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky dang xa hoi. hieu ((va cam) OR (va cao)) ((luc va) OR (loc va)) hanh vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky dang xa hoi. hieu ((va cam) OR (va cao)) ((luc va) or (loc va)) hanh vi cua tre".
• Adding a wildcard symbol may retrieve word variants: su sach ky dang xa hoi. hieu ((va cam) OR (va cao)) ((luc va) or (loc va)) hanh vi cua tre*.